#include<iostream>
#include<iomanip>
using namespace std;
const double PI = 3.14159;
int main()
{
	double r;
	cin >> r;
	cout << fixed << setprecision(4) << 2 * r;
	cout << " " << fixed << setprecision(4) << 2 * r * PI;
	cout << " " << fixed << setprecision(4) << PI * r * r;
	return 0;
}